Fair Value Measurements - Schedule of Fair Value of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Financial Assets:
Money market funds	$ 71,847	$ 83,991
Total financial assets	1,061,027	754,803
Liabilities:
CVR liability	6,760	26,680
Total liabilities	6,760	26,680
U.S. government treasury securities
Financial Assets:
Financial assets	305,536	266,064
U.S. government agency securities
Financial Assets:
Financial assets	173,901	119,590
Commercial paper
Financial Assets:
Financial assets	375,428	194,355
Corporate bonds
Financial Assets:
Financial assets	134,315	100,790
Money market funds
Financial Assets:
Money market funds	71,847	74,004
Level 1
Financial Assets:
Total financial assets	377,383	340,068
Liabilities:
CVR liability	0	0
Total liabilities	0	0
Level 1 | U.S. government treasury securities
Financial Assets:
Financial assets	305,536	266,064
Level 1 | U.S. government agency securities
Financial Assets:
Financial assets	0	0
Level 1 | Commercial paper
Financial Assets:
Financial assets	0	0
Level 1 | Corporate bonds
Financial Assets:
Financial assets	0	0
Level 1 | Money market funds
Financial Assets:
Money market funds	71,847	74,004
Level 2
Financial Assets:
Total financial assets	683,644	414,735
Liabilities:
CVR liability	6,760	0
Total liabilities	6,760	0
Level 2 | U.S. government treasury securities
Financial Assets:
Financial assets	0	0
Level 2 | U.S. government agency securities
Financial Assets:
Financial assets	173,901	119,590
Level 2 | Commercial paper
Financial Assets:
Financial assets	375,428	194,355
Level 2 | Corporate bonds
Financial Assets:
Financial assets	134,315	100,790
Level 2 | Money market funds
Financial Assets:
Money market funds	0	0
Level 3
Financial Assets:
Total financial assets	0	0
Liabilities:
CVR liability	0	26,680
Total liabilities	0	26,680
Level 3 | U.S. government treasury securities
Financial Assets:
Financial assets	0	0
Level 3 | U.S. government agency securities
Financial Assets:
Financial assets	0	0
Level 3 | Commercial paper
Financial Assets:
Financial assets	0	0
Level 3 | Corporate bonds
Financial Assets:
Financial assets	0	0
Level 3 | Money market funds
Financial Assets:
Money market funds	$ 0	$ 0